Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/10—Packings; Fillings; Grids
  • C02F3/105—Characterized by the chemical composition
  • C02F3/108—Immobilising gels, polymers or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
  • B01D53/84—Biological processes
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
  • C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
  • C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
  • C12N11/04—Enzymes or microbial cells immobilised on or in an organic carrier entrapped within the carrier, e.g. gel or hollow fibres
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

• the invention relates to biologically active compositions based on finely divided, surface-active carbon, polymers with cationic groups and hydrogels containing viable cells, and to a process for their preparation by reacting isocyanate prepolymers with aqueous suspensions which contain surface-active carbon and polymers with cationic groups, where the viable cells are immobilized directly with the aqueous suspensions or added to the hydrogel initially obtained in a second step.
• DE-A-2 629 692 describes the incorporation in photocurable resin, e.g. B. in polyurethane, which contains photocrosslinkable acrylate double bonds. Tanaka et al. in European Journal of Applied Microbiology and Biotechnology 7, (1979) pages 351 to 354 describe a method for embedding whole cells in polyurethane hydrogel. In the immobilized state, the non-viable cells have enzymatic activity in bioconversion processes.
• DE-A-2 929 872 describes the embedding of optionally viable cells in polyurethane hydrogels.
• the invention therefore relates to cells with enzymatic activity-containing carrier materials based on surface-active carbon, polymers with cationic groups and cells with enzymatic activity-containing polyurethane hydrogels, which are characterized in that the cells immobilized by means of polyurethane hydrogels are growth-capable cells.
• the invention further relates to a process for the production of biologically active compositions based on surface-active carbon, polymers with cationic groups and hydrogels containing viable cells; the process is characterized in that mixtures of surface-active carbon and polymers with cationic groups are gelled in polyurethane hydrogels, preferably with viable cells embedded directly or added to the gel obtained in a subsequent step.
• Di- and / or polyamines can optionally also be used in the production process, the use of water as the sole chain extender being preferred.
• the cells which can be used in the carrier materials according to the invention can be the cells which are present in the digested and activated sludge of sewage treatment plants and / or cells capable of growth adapted for the metabolism of special substances.
• the latter cells represent specially adapted conventional activated sludge organisms to increase the activity.
• the content of cell substance, based on dry matter, in the compositions according to the invention is 0.3 to 10, optionally 15% by weight, preferably 0.5 to 10% by weight, particularly preferably 0.8 to 5% by weight, based on the total weight of the reaction mixture for the preparation of the composition.
• Suitable polymers with cationic groups according to the invention are, for example, commercially available ion exchange resins with cationic groups or other polymers with structures containing nitrogen atoms, such as:
• Polyacrylamides with cationic groups polyethyleneimines with cationic groups, copolymers of acrylonitrile, styrene and dimethylaminoethyl methacrylate with cationic groups,
• compositions according to the invention are embedded in the compositions according to the invention as aqueous dispersions.
• the content of polymers with cationic Groups in the compositions according to the invention is 0.2-20% by weight, preferably 0.5-15% by weight, particularly preferably 1-10% by weight, based on the total weight of the reaction mixture for producing the composition.
• finely divided, surface-active carbon is understood to mean activated carbon or related substances or precursors for activated carbon which already show activated carbon properties such as high specific surface area, porosity and formation of surface charges.
• activated carbon or related substances or precursors for activated carbon which already show activated carbon properties such as high specific surface area, porosity and formation of surface charges.
• Such are e.g. B. by pyrolysis treated natural coal, pyrolyzed bone meal, soot, etc.
• An essential requirement is a specific surface area according to BET of above 50, preferably above 100 .
• Types of activated carbon which can be used according to the invention are those which are obtained in large-scale production processes, and those which have been neutralized by suitable additives and, moreover, have optionally been subjected to a so-called ash removal.
• the coal types can be used individually or in mixtures.
• the grain size of the surface-active coal types can be between 0.5 and 1000 gm.
• the content of these substances is 0.5 to 40% by weight, preferably 0.5 to 30% by weight, particularly preferably up to 20% by weight, based on the total weight of the reaction mixture.
• the covalently crosslinked polyurethane hydrogels contained in the support materials according to the invention can be obtained by reacting NCO prepolymers or semiprepolymers with water, which may contain di- or polyamines as chain extenders or crosslinkers. Such gels are e.g. B. in DE-A-2 347 299 and in DE-A-2 521 277.
• the prepolymers and semiprepolymers have isocyanate end groups and are prepared in a manner known per se by reacting polyethers which contain at least 30% by weight -CH 2 .CH 2 .0 units ("ethylene oxide units") with an excess amount of di- and / or polyisocyanate.
• the amount of di- and / or polyisocyanate is preferably such that the NCO / OH ratio is 2 to 10, depending on the desired properties of the prepolymer type to be produced.
• the isocyanate group content of the prepolymer or semiprepolymer is advantageously 1 to 15% by weight, preferably 2 to 10% by weight, particularly preferably 2.5 to 4.5% by weight, based on the weight of the prepolymer or Semiprepolymers.
• isocyanate prepolymers which have been freed from monomeric di- or polyisocyanates by suitable production steps, such as thin-layer distillation, to the extent that their monomer content is below 1% by weight, preferably below 0.5% by weight. %, the isocyanate content being 1.5 to 4% by weight, based on the thin-layer prepolymer.
• Preferred isocyanate prepolymers are therefore those based on tolylene diisocyanates.
• the starting material for the NCO prepolymers or semiprepolymers are at least two active hydrogen atom-containing polyoxyalkylene ethers with a molecular weight of 500 to 10,000, preferably 2,000 to 8,000, which contain at least 30% by weight of ethylene oxide groups in the form of oxyethylene groups [O.CH 2 .CH 2] , based on the weight of the polyether, in addition to preferably contain oxypropylene groups.
• Such polyethers are obtained by reacting compounds with reactive hydrogen atoms, e.g. B.
• di- or polyalcohols di- or polyphenols, aliphatic or aromatic di- or polyamines, with ethylene oxide and optionally alkylene oxides such as propylene oxide, butylene oxide, styrene oxide, epichlorohydrin or mixtures of these alkylene oxides.
• More than two-functional polyethers e.g. B. at least trifunctional ethers, since they give covalently cross-linked gels.
• NCO prepolymers or semiprepolymers are aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic polyisocyanates, such as z. B. by W. Siefken, Liebigs Annalen der Chemie, Volume 562, pages 75-136.
• suitable polyisocyanates are the polyisocyanates described in DE-A-2 347 299 and 2 521 277.
• suitable polyisocyanates are the tolylene diisocyanates, the diphenylmethane diisocyanates in the form of their 4,4'- and / or 2,4'- and / or 2,2'-isomers, furthermore mixtures of the diphenylmethane diisocyanates with their tri-atom and higher-core homologs and isomers.
• the tolylene diisocyanates are very particularly preferred as 2,4- or 2,6-isomers or their isomer mixtures.
• Aliphatic or cycloaliphatic di- and polyisocyanates can be used, e.g. B. hexamethylene-1,6-diisocyanate, isophorone diisocyanate, biuretized hexamethylene diisocyanate or dicyclohexylmethane diisocyanates in their positional and / or stereoisomers or mixtures thereof.
• the amount of the composition of the invention NCO prepolymers to be used (corresponding to the polyurethane solid) is 5 to 30% by weight, preferably 10 to 25% by weight, particularly preferably 15 to 20% by weight, based on the total weight of the reaction mixture for the preparation of the composition.
• the water to be used in the preparation of the composition according to the invention also fulfills the role of the reaction partner for the prepolymers having isocyanate groups.
• the water content is 20 to 90% by weight, preferably 40 to 85% by weight, particularly preferably 50 to 85% by weight, based on the total weight of the reaction mixture in the preparation of the composition.
• Di- and / or polyamines can optionally also be used as low molecular weight chain extenders or crosslinkers.
• Examples of such aliphatic, cycloaliphatic or aromatic di- or polyamines are: ethylenediamine, hexamethylene diamine, diethylene triamine, hydrazine, guanidine carbonate, N, N'-diisopropylhexamethylene diamine, 1,3-bisaminomethylbenzene, N, N'-bis (3-aminopropyl ) ethylenediamine, N, N'-bis (2-aminopropyl) ethylenediamine, N, N'-bis (2-aminoethyl) ethylenediamine, 4,4'-diamino-diphenylmethane, 4,4'-dimethylamino 3,3'-dimethyl-diphenylmethane, 2,4'-diamino-diphenylmethane and 2,4- or 2,6-di
• the content of di- or polyamines is 0.2 to 5%, preferably 1 to 4%, based on the total weight of the reaction mixture in the preparation of the composition.
• Additives which increase the density of the carrier materials according to the invention such as heavy spar, metal powder, rubber granules, clay powder, pumice powder, glass powder, flour from kernels and shells of olives, nuts or rock flour; density reducing substances, such as polystyrene beads, wood flour, flour from plastic waste, hollow microbeads, polyethylene foam flakes; coloring agents such as pigments, dyes; Short fibers of organic or inorganic basis such as glass fibers and gel-forming macromolecular substances such as cellulose types, alginates, starch, carrageenans can be added.
• the biologically active compositions according to the invention can be produced in various ways. You can e.g. B. all components, i.e. Combine gel formers, polymers with cationic groups, surface-active charcoal, water and cells all at once and mix intensively. But you can also combine the components one after the other.
• the NCO prepolymer or semi-prepolymer is first mixed with part of the water; then the cells slurried with the remaining water are stirred into this mixture.
• the gel-forming substance is first mixed intensively with water and then the cell suspension is added.
• Another preferred procedure with several stages according to the invention consists in firstly mixing together finely divided carbon and polymers with cationic groups and prepolymers in water and converting them into a gel. Subsequently, in further process steps, the gel obtained in the form of small particles is mixed with dispersions or slurries containing viable cells for 1 to 50 hours and the biologically active composition obtained is then separated from excess sludge or dispersion.
• the conveying, metering and mixing of the individual components or component mixtures can be carried out using the devices known per se to the person skilled in the art.
• the promotion and dosage of the cell suspension is e.g. B. possible with a suitable screw.
• the subsequent admixing of the cell suspension to the reactive, gel-forming mixture is carried out, for. B. performed in an agitator mixing chamber or static mixer. Air or nitrogen can be added to the gelable reaction mixture in order to obtain a foam-like gel mass.
• a foam gel can also by other measures such. B. increase in temperature of the water components or increase in concentration of the prepolymer component.
• By using cell-opening substances in the reaction mixture the foamed gel masses can be produced completely open-celled.
• Such cell openers are, for example, high ethers containing polyethers with at least trifunctional starter molecules. The amount of cell openers is 1-15% by weight, based on the total weight of the reaction mixture for the preparation of the composition.
• compositions according to the invention can be produced continuously or batchwise.
• the method of operation depends on the form that you want to give the materials of the invention. If you e.g. B. wants to produce blocks or bars that are then to be cut into thin plates, the discontinuous procedure is preferably carried out.
• the compositions according to the invention are intended, for. B. are produced in thin pieces of suitable dimensions, then the continuous procedure is more advantageous.
• the reactive cell-containing gel mixture can also be sprayed or knife-coated before it is solidified by the reaction.
• the reactive mixture can be applied to the various materials based on natural or synthetic raw materials, e.g. B. on foils, mats, nonwovens, knitted fabrics, knitted fabrics, fabrics or foam films.
• compositions according to the invention can be in a wide variety of forms, e.g. B. as granules, plate, film, block or tape. They are used according to the usual procedures in wastewater engineering under aerobic or anaerobic conditions.
• compositions according to the invention over the gel-like or foamed biocatalysts based on polyurethane known from German Offenlegungsschrift 2 929 872 is the improved degradation performance of industrial wastewater loaded with organic compounds.
• the improved effectiveness of the compositions according to the invention is particularly evident in industrial wastewater, e.g. B. nitro, chlorine and amino substituted aromatic compounds.
• Another advantage of the new compositions is that sensitive whole cells can also be embedded in them if isocyanate prepolymers with a low content of reactive isocyanate groups are also used as gel formers. The growth ability of whole cells sensitive to reactive isocyanates is retained in this way.
• the isocyanate prepolymer A used was obtained as follows:
• the prepolymer obtained has an isocyanate content of 3.7% and a viscosity of 9500 mPa.s at 25 ° C.
• Waste water which as an organic compound contained naphthalenesulfonic acids as well as nitro, chlorine and amino substituted aromatic compounds in concentrations up to 200 ppm, was treated with the compositions obtained according to example 1a).
• the wastewater was changed daily.
• the biodegradation rate of the biologically active composition was 98% of the organic carbon (TOC).
• the biologically active composition was prepared according to the procedure of Example 1. Instead of 1 part of ion exchange powder, 2 parts of a 26% by weight aqueous solution of a polyelectrolyte based on a polyaminocarboxylic acid ester with cationic groups (type: Praestol® 185 K, from Stockhausen) were used.
• the degradation performance of the composition was tested in accordance with the procedure of Example 1 with the type of waste water described therein. After a test period of likewise one month, the composition achieved a breakdown of the organic carbon of 92%.
• Example 3a 30 parts of the biologically active carrier material obtained according to Example 3a were placed in a vessel described in Example 3a and 500 milliliters of wastewater from the chlorine bleaching plant were added to a pulp mill.
• the wastewater had an organic carbon (TOC) content of 900 ppm.
• the mixture of waste water and carrier material was stirred at 50 revolutions per minute in the absence of oxygen.
• 50 milliliters of the treated wastewater were taken out each day and exchanged for 50 milliliters of new wastewater.
• Organic carbon (TOC) in the treated waste water 366 ppm.
• Biogas production (CH 4 + C0 2 ) 67 milliliters per day.
• the gel mass obtained was divided into particles of 2-3 millimeters in diameter. 160 parts of these particles were placed in an up-flow reactor of 1.6 liters and 120 milliliters of digested sludge (dry matter content 7.6 parts per liter) from the digestion tower of a municipal sewage treatment plant and 1 liter of vapor condensate were added.
• the vapor condensate obtained by evaporating the cooking liquor in the pulp production had a COD content of 44,000 ppm and was diluted to 4,900 ppm with water. After a stirring time of 24 hours at a temperature of 35 ° C. in the absence of air, biologically active carrier material was obtained.
• Example 4a In a 1.6 liter upflow reactor, 160 parts of the carrier material obtained in Example 4a were introduced and the vapor condensate described in Example 4a was continuously fed and removed with the aid of a metering pump under anaerobic conditions, the flow rate of waste water being 640 milliliters per day amounted to. After 43 days of continuous operation, the following value was found in the waste water running off: COD value: 3650 ppm.
• the prepolymer B used was obtained as follows:
• a mixture of 213 parts of tolylene diisocyanate (80% 2,4- and 20% 2,6-isomer) and 1587 parts of a polyether which had been obtained by adding 60% by weight of ethylene oxide and 40% by weight of propylene oxide to glycerol and having a hydroxyl number of 28 was heated to 80 ° C with stirring within 30 minutes. The reaction mixture was stirred at this temperature for a further 5 hours. Then excess monomeric tolylene diisocyanate was distilled off. The prepolymer obtained had an isocyanate content of 1.9% and a viscosity of 12,960 mPas at 25 ° C.
• the prepolymer C used was obtained as follows:
• the carrier material produced according to Example 6a was used in the up-flow reactor (33 liter content) to purify waste water under continuous and anaerobic conditions in the following manner:

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Microbiology (AREA)
• Organic Chemistry (AREA)
• Environmental & Geological Engineering (AREA)
• Health & Medical Sciences (AREA)
• Water Supply & Treatment (AREA)
• Hydrology & Water Resources (AREA)
• Biodiversity & Conservation Biology (AREA)
• Biomedical Technology (AREA)
• General Chemical & Material Sciences (AREA)
• Bioinformatics & Cheminformatics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Genetics & Genomics (AREA)
• Wood Science & Technology (AREA)
• Zoology (AREA)
• General Engineering & Computer Science (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Biotechnology (AREA)
• Dispersion Chemistry (AREA)
• Molecular Biology (AREA)
• Analytical Chemistry (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Polyurethanes Or Polyureas (AREA)
• Biological Treatment Of Waste Water (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)
• Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
• Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
• Fats And Perfumes (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Peptides Or Proteins (AREA)
• Detergent Compositions (AREA)
• Treating Waste Gases (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6195716

Family Applications (1)

Country Status (8)

Cited By (8)

Families Citing this family (40)

Family Cites Families (13)

• 1983
  • 1983-04-08 DE DE19833312578 patent/DE3312578A1/de not_active Withdrawn
• 1984
  • 1984-03-26 AT AT84103298T patent/ATE31940T1/de not_active IP Right Cessation
  • 1984-03-26 DE DE8484103298T patent/DE3468698D1/de not_active Expired
  • 1984-03-26 EP EP19840103298 patent/EP0121851B1/de not_active Expired
  • 1984-04-05 FI FI841358A patent/FI82070C/fi not_active IP Right Cessation
  • 1984-04-05 NO NO841352A patent/NO167302C/no unknown
  • 1984-04-05 JP JP59066858A patent/JPS59196090A/ja active Granted
  • 1984-04-06 CA CA000451485A patent/CA1224171A/en not_active Expired
• 1985
  • 1985-08-12 US US06/764,688 patent/US4634672A/en not_active Expired - Fee Related
• 1986
  • 1986-09-22 US US06/910,056 patent/US4681851A/en not_active Expired - Fee Related

Also Published As

Similar Documents

Legal Events